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Focused ultrasound is a treatment modality that can work in a few different ways. It is noninvasive, using sound energy waves that can be precisely focused on targets within the brain. The main way it has been used is to open the blood brain barrier so other drugs could get into the tumor at the right concentration. Many drugs look good in the lab but failed when used in people because they do not get to the right area in the right concentration. This can help. A new way it is being used it to sensitize the tumor with a dye, then the focused ultrasound beam can be used to kill those cells that take up the dye. Very exciting.